Examples of java.util.BitSet

java.util.BitSet
This class implements a vector of bits that grows as needed. Each component of the bit set has a boolean value. The bits of a BitSet are indexed by nonnegative integers. Individual indexed bits can be examined, set, or cleared. One BitSet may be used to modify the contents of another BitSet through logical AND, logical inclusive OR, and logical exclusive OR operations.
By default, all bits in the set initially have the value false.
Every bit set has a current size, which is the number of bits of space currently in use by the bit set. Note that the size is related to the implementation of a bit set, so it may change with implementation. The length of a bit set relates to logical length of a bit set and is defined independently of implementation.
Unless otherwise noted, passing a null parameter to any of the methods in a BitSet will result in a NullPointerException.
A BitSet is not safe for multithreaded use without external synchronization. @author Arthur van Hoff @author Michael McCloskey @author Martin Buchholz @version 1.67, 04/07/06 @since JDK1.0

    
    if (y < 0 || y - 1 + height >= this.height) {
      return true;
    }


    final BitSet result = new BitSet();
    for (int i = x; i < x + width; i++) {
      result.or(colls[i]);
    }


    return !result.get(y, y + height).isEmpty();
  }

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     *
     * @return converted boolean array as BitSet
     */
    public static BitSet getBitSetFromBooleanArray(boolean[] buf)
    {
        BitSet set = new BitSet();
        for (int i = 0; i < buf.length; i++)
        {
            if( buf[i] )
            {
                set.set(i);
            }
        }


        return set;
    }

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  }


  public String decode(final String str) {
    try {
      // create a BitSet based on the binary representation
      final BitSet nameSet = createBitSet(str); 
       // xor the BitSet with the key
      nameSet.xor(key);


      // turn the xor'd BitSet back into a String
      final StringBuilder strBuff = new StringBuilder(str.length() * 7);
      for (int i = 0; i < nameSet.size(); i++) {
        if (nameSet.get(i)) {
          strBuff.append('1');
        } else {
          strBuff.append('0');
        }
      }

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      stringSizeBinary = stringToBinary(sizeOfEncodedString.substring(
          i - 1, i));
      binaryString = stringSizeBinary.concat(binaryString);
    }
    // create a BitSet based on the binary representation
    final BitSet nameSet = createBitSet(binaryString);
    // xor the BitSet with the key
    nameSet.xor(key); 


    // turn the xor'd BitSet back into a String so it can be written to file
    final StringBuilder strBuff = new StringBuilder(str.length() * 7);
    for (int i = 0; i < nameSet.size(); i++) {
      if (nameSet.get(i)) {
        strBuff.append('1');
      } else {
        strBuff.append('0');
      }
    }

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  /** creates a BitSet based on a string representation of binary digits. 
   * @param binaryString 
   * @return the created BitSet 
   * */
  private BitSet createBitSet(final String binaryString) {
    final BitSet bset = new BitSet(binaryString.length());
    boolean bitTrue = false;
    for (int i = 0; i < binaryString.length(); i++) {
      if (binaryString.charAt(i) == '1') {
        bitTrue = true;
      } else {
        bitTrue = false;
      }
      bset.set(i, bitTrue);
    }
    return bset;
  }

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    private void playbackSavepoint(PagerSavepoint pSavepoint) throws SqlJetException {
        long szJ; /* Effective size of the main journal */
        long iHdrOff; /* End of first segment of main-journal records */
        int ii; /* Loop counter */
        SqlJetException rc = null; /* Return code */
        BitSet pDone = null; /* Bitvec to ensure pages played back only once */


        /* Allocate a bitvec to use to store the set of pages rolled back */
        if (pSavepoint != null) {
            pDone = new BitSet(pSavepoint.nOrig);
        }


        /*
         * Truncate the database back to the size it was before the savepoint
         * being reverted was opened.

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             */
            assert (nRec == 0);
            assert (dbOrigSize == 0);
            assert (pagesInJournal == null);
            getPageCount();
            pagesInJournal = new BitSet(dbSize);
            dbOrigSize = dbSize;
            writeJournalHdr();
        }
        assert (!journalOpen || journalOff > 0);
    }

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        assert (state.compareTo(SqlJetPagerState.RESERVED) >= 0);
        assert (useJournal);
        assert (pagesInJournal == null);


        getPageCount();
        pagesInJournal = new BitSet(dbSize);


        try {


            if (!journalOpen) {
                if (tempFile) {

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                    aNew[ii].iOffset = journalOff;
                } else {
                    aNew[ii].iOffset = JOURNAL_HDR_SZ();
                }
                aNew[ii].iSubRec = stmtNRec;
                aNew[ii].pInSavepoint = new BitSet(dbSize);
            }


            /* Open the sub-journal, if it is not already opened. */
            openSubJournal();
        }

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            return;
        }


        if (pPager.pagesAlwaysRollback == null) {
            assert (pPager.pagesInJournal != null);
            pPager.pagesAlwaysRollback = new BitSet(pPager.dbOrigSize);
        }
        pPager.pagesAlwaysRollback.set(pgno);
        if (flags.contains(SqlJetPageFlags.DIRTY) && pPager.nSavepoint == 0) {
            assert (pPager.state.compareTo(SqlJetPagerState.SHARED) >= 0);
            if (pPager.dbSize == pgno && pPager.dbOrigSize < pPager.dbSize) {

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